Interface circuit adaptive to high speed and low voltage operati

Details Interface circuit adaptive to high speed and low voltage operati Interface circuit adaptive to high speed and low voltage operati

1994-10-07

1996-04-30

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327108, 327379, 327389, 327564, 327565, 327566, 326 21, 326 23, H03L 500, H03K 1716, H03B 100, H01L 2500

Patent

active

055128530

ABSTRACT:
An interface circuit for interfacing between an integrated circuit (IC) on a transmitting side and an IC on a receiving side over a line on a printed circuit board comprises an output circuit implemented in the IC on the transmitting side and composed of a current source for supplying a given current and a switching circuit for cutting off the given current according to a binary signal and delivering the given current as a current signal to the line, and an input circuit implemented in the IC on the receiving side and composed of a transimpedance circuit whose input impedance is equal to the one of the line and which converts the current signal into a voltage signal, and a comparator for identifying the voltage signal relative to a given threshold voltage and reproducing the binary signal. This circuitry makes it possible to provide an interface circuit that can be implemented in a CMOS IC during CMOS processing and operated at a low voltage. A threshold voltage for use in identifying a signal on the receiving side is stabilized, thus realizing an interface circuit unsusceptible to influence of a change in CMOS processing or the like.

REFERENCES:
patent: 4481676 (1984-11-01), Eumurian et al.
patent: 4694504 (1987-09-01), Porter et al.

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